What's the harshest way you've ever broken up with someone?

I walked into a party at his house and called him a jackass. I told him I never wanted to see him again and to delete my number. And I said he was just as pathetic as everyone assumes he is. In front of everyone. And then I walked out. He followed me out of the house and I just got in my car and drove off and smiled and waved to everyone.

He was a personal trainer...he was always talking about how people automatically judged him as a "player"...

:)